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<!doctype html public "-//W3C//DTD HTML 3.2//EN"><html><head><title>Linux/fs/open.c</title><meta http-equiv=Content-Type content="text/html; charset=gb2312"><base href="http://oldlinux.org/lxr/http/"></head><body bgcolor=white><div align=center> [<b><i>源代码浏览</i></b>] [<a href="diff/fs/open.c">区别标定</a>] [<a href="ident">标识符搜索</a>] [<a href="search">文本搜索</a>] [<a href="find">文件搜索</a>]</div><h1 align=center> <a href="http:/"> OldLinux</a> <a href="http:blurb.html"> 交叉引用</a><br> <a href="source/">Linux</a>/<a href="source/fs/">fs</a>/<a href="source/fs/open.c">open.c</a></h1><div align=center> <b>版本:</b> [<a href="source/fs/open.c?v=1.0">1.0</a>] [<a href="source/fs/open.c?v=0.99.11">0.99.11</a>] [<a href="source/fs/open.c?v=0.99">0.99</a>] [<a href="source/fs/open.c?v=0.97">0.97</a>] [<a href="source/fs/open.c?v=0.96a">0.96a</a>] [<a href="source/fs/open.c?v=0.95">0.95</a>] [<a href="source/fs/open.c?v=0.12">0.12</a>] [<b><i>0.11</i></b>] [<a href="source/fs/open.c?v=0.01">0.01</a>] <br> <b>体系结构:</b> [<b><i>i386</i></b>] <br></div><hr><pre> <a name=L1 href="source/fs/open.c#L1">1</a> <b><i>/*</i></b> <a name=L2 href="source/fs/open.c#L2">2</a> <b><i> * linux/fs/open.c</i></b> <a name=L3 href="source/fs/open.c#L3">3</a> <b><i> *</i></b> <a name=L4 href="source/fs/open.c#L4">4</a> <b><i> * (C) 1991 Linus Torvalds</i></b> <a name=L5 href="source/fs/open.c#L5">5</a> <b><i> */</i></b> <a name=L6 href="source/fs/open.c#L6">6</a> <a name=L7 href="source/fs/open.c#L7">7</a> #include <string.h> <a name=L8 href="source/fs/open.c#L8">8</a> #include <errno.h> <a name=L9 href="source/fs/open.c#L9">9</a> #include <fcntl.h> <a name=L10 href="source/fs/open.c#L10">10</a> #include <sys/types.h> <a name=L11 href="source/fs/open.c#L11">11</a> #include <utime.h> <a name=L12 href="source/fs/open.c#L12">12</a> #include <sys/stat.h> <a name=L13 href="source/fs/open.c#L13">13</a> <a name=L14 href="source/fs/open.c#L14">14</a> #include <linux/sched.h> <a name=L15 href="source/fs/open.c#L15">15</a> #include <linux/tty.h> <a name=L16 href="source/fs/open.c#L16">16</a> #include <linux/kernel.h> <a name=L17 href="source/fs/open.c#L17">17</a> #include <asm/segment.h> <a name=L18 href="source/fs/open.c#L18">18</a> <a name=L19 href="source/fs/open.c#L19">19</a> int <a href="ident?i=sys_ustat">sys_ustat</a>(int dev, struct <a href="ident?i=ustat">ustat</a> * ubuf) <a name=L20 href="source/fs/open.c#L20">20</a> { <a name=L21 href="source/fs/open.c#L21">21</a> return -<a href="ident?i=ENOSYS">ENOSYS</a>; <a name=L22 href="source/fs/open.c#L22">22</a> } <a name=L23 href="source/fs/open.c#L23">23</a> <a name=L24 href="source/fs/open.c#L24">24</a> int <a href="ident?i=sys_utime">sys_utime</a>(char * filename, struct <a href="ident?i=utimbuf">utimbuf</a> * <a href="ident?i=times">times</a>) <a name=L25 href="source/fs/open.c#L25">25</a> { <a name=L26 href="source/fs/open.c#L26">26</a> struct <a href="ident?i=m_inode">m_inode</a> * inode; <a name=L27 href="source/fs/open.c#L27">27</a> long actime,modtime; <a name=L28 href="source/fs/open.c#L28">28</a> <a name=L29 href="source/fs/open.c#L29">29</a> if (!(inode=<a href="ident?i=namei">namei</a>(filename))) <a name=L30 href="source/fs/open.c#L30">30</a> return -<a href="ident?i=ENOENT">ENOENT</a>; <a name=L31 href="source/fs/open.c#L31">31</a> if (<a href="ident?i=times">times</a>) { <a name=L32 href="source/fs/open.c#L32">32</a> actime = <a href="ident?i=get_fs_long">get_fs_long</a>((unsigned long *) &<a href="ident?i=times">times</a>->actime); <a name=L33 href="source/fs/open.c#L33">33</a> modtime = <a href="ident?i=get_fs_long">get_fs_long</a>((unsigned long *) &<a href="ident?i=times">times</a>->modtime); <a name=L34 href="source/fs/open.c#L34">34</a> } else <a name=L35 href="source/fs/open.c#L35">35</a> actime = modtime = <a href="ident?i=CURRENT_TIME">CURRENT_TIME</a>; <a name=L36 href="source/fs/open.c#L36">36</a> inode->i_atime = actime; <a name=L37 href="source/fs/open.c#L37">37</a> inode->i_mtime = modtime; <a name=L38 href="source/fs/open.c#L38">38</a> inode->i_dirt = 1; <a name=L39 href="source/fs/open.c#L39">39</a> <a href="ident?i=iput">iput</a>(inode); <a name=L40 href="source/fs/open.c#L40">40</a> return 0; <a name=L41 href="source/fs/open.c#L41">41</a> } <a name=L42 href="source/fs/open.c#L42">42</a> <a name=L43 href="source/fs/open.c#L43">43</a> <b><i>/*</i></b> <a name=L44 href="source/fs/open.c#L44">44</a> <b><i> * XXX should we use the real or effective uid? BSD uses the real uid,</i></b> <a name=L45 href="source/fs/open.c#L45">45</a> <b><i> * so as to make this call useful to setuid programs.</i></b> <a name=L46 href="source/fs/open.c#L46">46</a> <b><i> */</i></b> <a name=L47 href="source/fs/open.c#L47">47</a> int <a href="ident?i=sys_access">sys_access</a>(const char * filename,int mode) <a name=L48 href="source/fs/open.c#L48">48</a> { <a name=L49 href="source/fs/open.c#L49">49</a> struct <a href="ident?i=m_inode">m_inode</a> * inode; <a name=L50 href="source/fs/open.c#L50">50</a> int res, i_mode; <a name=L51 href="source/fs/open.c#L51">51</a> <a name=L52 href="source/fs/open.c#L52">52</a> mode &= 0007; <a name=L53 href="source/fs/open.c#L53">53</a> if (!(inode=<a href="ident?i=namei">namei</a>(filename))) <a name=L54 href="source/fs/open.c#L54">54</a> return -<a href="ident?i=EACCES">EACCES</a>; <a name=L55 href="source/fs/open.c#L55">55</a> i_mode = res = inode->i_mode & 0777; <a name=L56 href="source/fs/open.c#L56">56</a> <a href="ident?i=iput">iput</a>(inode); <a name=L57 href="source/fs/open.c#L57">57</a> if (<a href="ident?i=current">current</a>->uid == inode->i_uid) <a name=L58 href="source/fs/open.c#L58">58</a> res >>= 6; <a name=L59 href="source/fs/open.c#L59">59</a> else if (<a href="ident?i=current">current</a>->gid == inode->i_gid) <a name=L60 href="source/fs/open.c#L60">60</a> res >>= 6; <a name=L61 href="source/fs/open.c#L61">61</a> if ((res & 0007 & mode) == mode) <a name=L62 href="source/fs/open.c#L62">62</a> return 0; <a name=L63 href="source/fs/open.c#L63">63</a> <b><i>/*</i></b> <a name=L64 href="source/fs/open.c#L64">64</a> <b><i> * XXX we are doing this test last because we really should be</i></b> <a name=L65 href="source/fs/open.c#L65">65</a> <b><i> * swapping the effective with the real user id (temporarily),</i></b> <a name=L66 href="source/fs/open.c#L66">66</a> <b><i> * and then calling suser() routine. If we do call the</i></b> <a name=L67 href="source/fs/open.c#L67">67</a> <b><i> * suser() routine, it needs to be called last. </i></b> <a name=L68 href="source/fs/open.c#L68">68</a> <b><i> */</i></b> <a name=L69 href="source/fs/open.c#L69">69</a> if ((!<a href="ident?i=current">current</a>->uid) && <a name=L70 href="source/fs/open.c#L70">70</a> (!(mode & 1) || (i_mode & 0111))) <a name=L71 href="source/fs/open.c#L71">71</a> return 0; <a name=L72 href="source/fs/open.c#L72">72</a> return -<a href="ident?i=EACCES">EACCES</a>; <a name=L73 href="source/fs/open.c#L73">73</a> } <a name=L74 href="source/fs/open.c#L74">74</a> <a name=L75 href="source/fs/open.c#L75">75</a> int <a href="ident?i=sys_chdir">sys_chdir</a>(const char * filename) <a name=L76 href="source/fs/open.c#L76">76</a> { <a name=L77 href="source/fs/open.c#L77">77</a> struct <a href="ident?i=m_inode">m_inode</a> * inode; <a name=L78 href="source/fs/open.c#L78">78</a> <a name=L79 href="source/fs/open.c#L79">79</a> if (!(inode = <a href="ident?i=namei">namei</a>(filename))) <a name=L80 href="source/fs/open.c#L80">80</a> return -<a href="ident?i=ENOENT">ENOENT</a>; <a name=L81 href="source/fs/open.c#L81">81</a> if (!<a href="ident?i=S_ISDIR">S_ISDIR</a>(inode->i_mode)) { <a name=L82 href="source/fs/open.c#L82">82</a> <a href="ident?i=iput">iput</a>(inode); <a name=L83 href="source/fs/open.c#L83">83</a> return -<a href="ident?i=ENOTDIR">ENOTDIR</a>; <a name=L84 href="source/fs/open.c#L84">84</a> } <a name=L85 href="source/fs/open.c#L85">85</a> <a href="ident?i=iput">iput</a>(<a href="ident?i=current">current</a>->pwd); <a name=L86 href="source/fs/open.c#L86">86</a> <a href="ident?i=current">current</a>->pwd = inode; <a name=L87 href="source/fs/open.c#L87">87</a> return (0); <a name=L88 href="source/fs/open.c#L88">88</a> } <a name=L89 href="source/fs/open.c#L89">89</a> <a name=L90 href="source/fs/open.c#L90">90</a> int <a href="ident?i=sys_chroot">sys_chroot</a>(const char * filename) <a name=L91 href="source/fs/open.c#L91">91</a> { <a name=L92 href="source/fs/open.c#L92">92</a> struct <a href="ident?i=m_inode">m_inode</a> * inode; <a name=L93 href="source/fs/open.c#L93">93</a> <a name=L94 href="source/fs/open.c#L94">94</a> if (!(inode=<a href="ident?i=namei">namei</a>(filename)))⌨️ 快捷键说明
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